When you Quickbooks is not able to connect to the Financial Institution.
Root Cause- sometime during this Error Quickbooks will show you this error when you connecting to your bank through QuickBooks.
If Quickbooks FCS services is disabled.
Complete Name of this services-intuit FCS services.
How to check the status of this Services.
Windows Key+R>Run>Type command MSCONFIG>OK>System Configuration Screen go to Services+Press Letter Q on you keyboard to see all QuickBooks related services.
After that, you will see three different services check the status.